Fix pep8

Author: Martin Journois

tests/test_notebooks.py

@@ -10,12 +10,11 @@
 import sys
 import folium
 
-if sys.version_info[:2]==(3,4):
+if sys.version_info[:2] == (3, 4):
     import nbconvert
 
     rootpath = os.path.abspath(os.path.dirname(__file__))
 
-
     class NotebookTester(object):
         def __init__(self, filename):
             self.filename = filename
@@ -32,7 +31,6 @@ def __call__(self, exporter=None, filename=None):
                     filename = self.filename[:-6] + exporter.file_extension
                 open(filename, 'w').write(out_nb[0].encode('utf-8'))
 
-
     class TestNotebooks(object):
         _filepath = rootpath.rstrip('/')+'/../examples/'
         _nblist = [x for x in os.listdir(_filepath) if x.endswith('.ipynb')]